Product Description
Cummins 4955855 OEM Main Bearing Set (Standard) – B-Series / Ram 5.9L & 6.7L (1989–2018)
The Cummins 4955855 OEM Main Bearing Set (Standard) is a genuine Cummins replacement bearing kit engineered for B-Series 5.9L and 6.7L diesel engines used in Dodge and Ram trucks from 1989 through 2018. Manufactured to Cummins OE specifications, this standard-size main bearing set delivers precise oil clearances, exceptional wear resistance, and long-lasting crankshaft protection for stock, towing, commercial, agricultural, and performance applications.
Whether you're rebuilding a 12-Valve 5.9L, VP44-equipped ISB, Common Rail 5.9L, or a 6.7L Cummins, the 4955855 bearing set provides the OE-quality fit, metallurgy, and durability required for a dependable bottom-end rebuild. Genuine Cummins bearings help ensure proper oil film control, crankshaft support, and long service life under demanding operating conditions.
Features
- Genuine Cummins OEM main bearing set
- Standard-size bearings for standard crankshaft journals
- Engineered to Cummins OE specifications
- Designed for proper oil clearance and bearing crush fit
- Provides excellent crankshaft support and durability
- High-quality metallurgy for long service life
- Ideal for engine rebuilds and overhauls
- Supports stock, towing, commercial, agricultural, and performance applications
- Includes thrust bearing components required during rebuilds
- Direct replacement for original factory bearings
Fitment
- 1989–1998 Dodge Ram 5.9L 12-Valve Cummins
- 1998.5–2002 Dodge Ram 5.9L 24-Valve Cummins (VP44)
- 2003–2007 Dodge Ram 5.9L Common Rail Cummins
- 2007.5–2018 Ram 6.7L Cummins
- Cummins B-Series diesel engines
- Industrial, agricultural, and commercial B-Series applications
Note: This is a standard-size bearing set intended for crankshafts that remain within OEM journal specifications. Always measure crankshaft journals before installation to determine whether standard or undersize bearings are required.
What's Included
- Cummins 4955855 OEM Main Bearing Set (Standard)
- Main Bearing Components
- Thrust Bearing Components
Specifications
- Manufacturer: Cummins
- Part Number: 4955855
- Component Type: Main Bearing Set
- Bearing Size: Standard
- Application: Cummins B-Series Diesel Engines
- Engine Compatibility: 5.9L and 6.7L Cummins
- Fitment Years: 1989–2018
- Material: Cummins OE Bearing Alloy Construction
- Includes Thrust Bearing: Yes
- Supersedes: Cummins 3802010
- Package Weight: Approximately 2.0–2.1 lbs
- Application Type: Engine Rebuild and Overhaul
Cross Reference Numbers
4955855, 3802010, 3978818, 3978820, 4938948
FAQ
Are the Cummins 4955855 bearings standard size?
Yes. The 4955855 kit contains standard-size main bearings designed for crankshafts that remain within original factory specifications.
Will these bearings fit both 5.9L and 6.7L Cummins engines?
Yes. This bearing set is commonly used across B-Series 5.9L and 6.7L Cummins applications from 1989 through 2018.
Should thrust bearings be replaced during an engine rebuild?
Yes. Replacing thrust bearings during a bottom-end rebuild helps maintain proper crankshaft alignment and long-term durability.
How do I know if I need undersize bearings instead?
The crankshaft main journals should be measured with precision tools during the rebuild process. If the crankshaft has been machined undersize, undersize bearings will be required.
Why use genuine Cummins bearings instead of aftermarket alternatives?
Genuine Cummins bearings are manufactured to OE specifications for fit, metallurgy, oil clearance, and durability, helping ensure long-term reliability and performance.
Is this part suitable for performance engine builds?
Yes. The 4955855 bearing set is commonly used in stock rebuilds, towing applications, commercial engines, and high-performance diesel builds that require OEM-quality engine components.
